Observation of 2 near-infrared spectroscopies measuring cerebral oxygen saturation after cardiac surgery in adults and children

doi:10.3760/cma.j.issn.1673-4777.2016.07.012

Abstract：Objective To compare NIRO-200nx near-infrared spectroscopy and EGOS-600A near-infrared spectroscopy in measuring cerebral oxygen saturation (rScO2) after cardiac surgery in adults and children.Methods Liquid blood model included human whole blood 40ml,20％ intralipid 25ml and phosphate buffer solution 935 ml;a range of 20％-100％ of oxygen saturation(SpO2) was made by inflating oxygen and adding sodium hydrosulfite;values f SpO2 were measured at stable states.Twenty adults and 31 children 1 week after cardiac surgery from July to August in 2014 in Beijing Anzhen Hospital,Capital Medical University were enrolled;probes of 2 kinds of spectrometers were sequentially randomly placed at the middle of forehead to measure rScO2 every 2-3 h.Bland-Altman test and correlation analysis were used for data analysis.Results Eleven pairs of SpO2 totally and 100 pairs of rScO2 respectively were collected from 2 kinds of spectrometers.In laboratory test,the correlation coefficient was 0.9983,the deviation was-2％ and the consistent limit was-24％-20％.EGOS-600A spectrometer overestimated SpO2 when the mean value was below 50％,and it underestimated SpO2 when the mean value was beyond 50％.Values of SpO2 were analyzed within clinical physiological range (SpO2 40％-80％);the deviation was -8％ and the consistent limit was-20％-4％.In clinical test,the deviations were-5.9％ and-4.1％,the consistent limits were-13.6-1.8％ and-11.8％-3.5％ respectively in children and adults.Conclusion EGOS-600A near-infrared spectroscopy slightly underestimates rScO2 compared to NIRO-200nx near-infrared spectroscopy.EGOS-600A near-infrared spectroscopy can be used in clinical monitoring of rScO2 in adults and children.